Python While循环（检查行6）

Question

def purchace(): 
    total=0 
    while keepgoing == ("y" or "Y"): 

    item= float(input("Enter price of the item") 
    if (item<=100): 
     dis=(.15*item) 
     price=(item-dis) 
    else: 
     dis=(.25*item) 
     price=(item-dis) 
    total+= item 
    keepgoing = raw_input("Do you want to add more items? (y/n)") 

print("Your total is ",total)      
print("Thank you") 

def main(): 
    purchase() 
main() 

第6行存在语法错误“if（item < = 100）：”它特别强调在冒号“：”，是不是如何使if在Python中的语句？我应该继续在while循环之前定义吗？

Answer 1

你错过了上一行的关闭右括号：

item = float(input("Enter price of the item")) 

Answer 2

def purchase(): 
total=0 
keepgoing = "y" 
while keepgoing == ("y" or "Y"): 

    item= float(input("Enter price of the item: ")) 
    if (item<=100): 
     dis=(.15*item) 
     price=(item-dis) 
    else: 
     dis=(.25*item) 
     price=(item-dis) 
    total+= price 
    keepgoing = raw_input("Do you want to add more items? (y/n)") 

print("Your total is ",total)      
print("Thank you") 

def main(): 
    purchase() 
main() 

这一个完美运行，对原单我错过了其他几件事情太